Support

CAI

CAI - Common Air Interface; a standard developed for the UK’s public CT2 networks which enabled the same handset to be used on different networks

Calendar

Calendar - Calendar feature allows you to store scheduling and event information in your phone. Some phones also offer the ability to sound an alert to remind you of upcoming events.

Call barring

Call barring - A service which enables users to bar certain incoming or outgoing calls on their mobile phones

Call divert

Call divert - The capability to divert incoming calls to another phone (fixed or mobile) or to an answering service

Call hold

Call hold - The ability to put an ongoing call on hold whilst answering or making a second call

Call timer

Call timer - A service which keeps track of the amount of airtime being used by the subscriber on a cumulative basis

Caller ID

Caller ID - Caller Identification; displays the name/number of the person calling a mobile phone. Also known as CLI

CAMEL

CAMEL - Customised Application for Mobile network Enhanced Logic; an IN feature in GSM networks that enables users to carry personal services with them when roaming into other networks that support CAMEL

Capacity

Capacity - A measure of a cellular network’s ability to support simultaneous calls

CB

CB - Cell Broadcast

CC

CC - Call Control; manages call connections

CCB

CCB - Customer Care and Billing

CCCH

CCCH - Common Control Channels; a group of uplink and downlink channels between the MS and the BTS (see PCH, AGCH and RACH)

CCS7

CCS7 - Common Channel Signalling No. 7

CDMA

CDMA - Code Division Multiple Access. A type of digital wireless technology that allows large amounts of voice and data to be transmitted on the same frequency. CDMA is second-generation cellular technology (or 2G) and is available in Canada, the United States, Pacific Asia, and Latin America. Most CDMA service providers will migrate to a high-speed data technology called 1xRTT. The CDMA phones are not listed on GSMArena.com.

CDMA 1X

CDMA 1X - The first generation of cdma2000; the standardisation process indicated that there would be CDMA 2X and CDMA 3X but this no longer appears likely

CDMA 1X EV-DO

CDMA 1X EV-DO - A variant of CDMA 1X which delivers data only

CDMA2000

CDMA2000 - A member of the IMT-2000 3G family; backwardly compatible with cdmaOne

CDMAone

CDMAone - The first commercial CDMA cellular system; deployed in North America and Korea; also known as IS-95

CDPSK

CDR

CDR - Call Detail Records; the record made within the cellular network of all details of both incoming and outgoing calls made by subscribers, The CDR is passed to the billing system for action

Cell

Cell - The area covered by a cellular base station. A cell site may sectorise its antennas to service several cells from one locationCell siteThe facility housing the transmitters/receivers, the antennas and associated equipment

Cell splitting

Cell splitting - The process of converting a single cell to multiple cells by sectorising the antennas in the cell site or constructing additional cells within a cell site

CELP

CELP - Code Excited Linear Prediction; an analogue to digital voice coding scheme, there are a number of variants used in cellular systems

CEPT

CEPT - Conference of European Posts and Telecommunications. A organisation of national posts, telegraphs and telephone administrations. Until 1988, when this work was take over by ETSI, the main European body for telecommunications standardisation. CEPT established the original GSM standardisation group

CF

CF - Call Forwarding

CI

CI - Carrier to Interference ratio

CIBER

CIBER - Cellular Intercarrier Billing Exchange Roamer Record

CID

CID - Caller Identification

Circuit switching

Circuit switching - A method used in telecommunications where a temporary dedicated circuit of constant bandwidth is established between two distant endpoints in a network. Mainly used for voice traffic; the opposite of packet switching

CLI

CLI - See Caller ID

CLID

CLID - Calling Line Identification

CLIP

CLIP - Calling Line Identification Presentation

CLIR

CLIR - Calling Line Identification Restriction

CLR

CLR - Clear; the key on a cellular phone which is pressed to remove information from the display

CM

CM - Connection Management; is used to set up, maintain and take down call connections

CMOS

CMOS - Complementary Metal Oxide Substrate

Codec

Codec - A word formed by combining coder and decoder the codec is a device which encodes and decodes signals. The voice codec in a cellular network converts voice signals into and back from bit strings. In GSM networks, in addition to the standard voice codec, it is possible to implement Half Rate (HR) codecs and Enhanced Full Rate (EFR) codecs

Control signal

Control signal - A signal sent to a cellular phone from a base station or vice versa which carries information essential to the call but not including the audio portion of a conversation

CPE

CPE - Customer Premises Equipment; all the equipment on the end user’s side of the network interface

CPU

CPU - Central Processing Unit

CRC

CRC - Cyclic Redundancy Check

CRM

CRM - Customer Relationship Management

CSE

CSE - CAMEL Service Environment

CSS

CSS - Customer Support System

CT

CT - Cordless Telephony

CT0

CT0 - Zero generation cordless telephony; the earliest domestic cordless phones which used analogue technology and which had severe limitations in terms of range and security

CT1

CT1 - First generation cordless telephony; Improved analogue phones with greater range and security; a number of European nations produced CT1 standards

CT2

CT2 - Second generation cordless telephony; Using digital technology CT2 phones offered greater range, improved security and a wide range of new functionalities. Used in both domestic and cordless PABX deployments, CT2 was standardised as an interim ETS but was overwhelmed by DECT

CT2-CAI

CT2-CAI - Second generation cordless telephony-common air interface

CTA

CTA - Cordless Terminal Adaptor; a DECT term

CTM

CTM - Cordless Terminal Mobility

CTR

CTR - Common Technical Regulation; part of the ETSI standardisation process